12215776 has 24 divisors (see below), whose sum is σ = 24169320. Its totient is φ = 6077568.

The previous prime is 12215761. The next prime is 12215779. The reversal of 12215776 is 67751221.

12215776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6495 + ... + 8161.

It is an arithmetic number, because the mean of its divisors is an integer number (1007055).

Almost surely, 2^12215776 is an apocalyptic number.

12215776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

12215776 is the 2211-st centered pentagonal number.

It is an amenable number.

12215776 is a deficient number, since it is larger than the sum of its proper divisors (11953544).

12215776 is a wasteful number, since it uses less digits than its factorization.

12215776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1898 counting only the distinct ones).

The product of its digits is 5880, while the sum is 31.

The square root of 12215776 is about 3495.1074375475. The cubic root of 12215776 is about 230.3069374026.

Adding to 12215776 its reverse (67751221), we get a palindrome (79966997).

The spelling of 12215776 in words is "twelve million, two hundred fifteen thousand, seven hundred seventy-six".